Windows 8 and 8.1 Forums


UEFI Bootable USB Flash Drive - Create in Windows

  1. #430


    Posts : 24
    8.1 pro + Ubuntu


    Hmmm... so I now need to try and understand whether first of all it's actually worth me working out how to create a UEFI win 7x64 usb installer that works and compare that to the actual tangible benefit of having UEFI mode.

    The Rufus installer in GPT/UEFI kept hanging as I said originally tho someone else suggested that it's important to ensure none of the settings are changed once the ISO is loaded and I can't recall if I did... or not... I certainly created the installer several times with same result.

    The second option to create looks rather more long winded.

    And I'll need to reload all the drivers again.

    This laptop is 100% purely for using as a video editor.... with Sony Vegas Pro and possibly a couple of codec utilities.

    Would I notice the difference between CSM and UEFI...?

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  2. #431


    Posts : 22,272
    64-bit Windows 10


    base,

    Using Option One would be the easiest way to create a bootable UEFI USB. Just be sure to double check all the settings before starting.

    Personally, I don't think you'll notice any difference in performance between UEFI and Legacy (CSM) with Windows 7.
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  3. #432


    Posts : 11
    Windows 7


    If you install in (CSM) mode in UEFI computer, will it be able to boot from disks over 2 TB?
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  4. #433


    Posts : 11
    Windows 7


    Quote Originally Posted by base1268 View Post
    The Rufus installer in GPT/UEFI kept hanging as I said originally tho someone else suggested that it's important to ensure none of the settings are changed once the ISO is loaded and I can't recall if I did... or not... I certainly created the installer several times with same result.
    As far as I know, Rufus (by design) only allows to create a USB flash drive that's UEFI bootable ONLY or Legacy BIOS bootable ONLY, and it does not allow to create a USB flash drive that can be booted in both UEFI and Legacy BIOS mode at the same time. I think that is what is causing your hang problem.

    If you want to boot and install in CSM mode, you need to set the Partition scheme and target system type in Rufus to "MBR partition scheme for BIOS or UEFI computers" which will make your USB flash drive Legacy BIOS bootable ONLY.

    If you want to boot and install in native UEFI mode you need to set the Partition scheme and target system type in Rufus to either "MBR partition scheme for UEFI computer" or "GPT partition scheme for UEFI computer" which will make your USB flash drive UEFI bootable ONLY.

    And make sure you set the boot mode in your UEFI firmware settings to UEFI mode or to CSM mode correspondingly -- that is UEFI mode for UEFI bootable flash drive, or CSM mode for BIOS bootable flash drive.

    I hope this helps
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  5. #434


    Posts : 879
    Windows 10


    Quote Originally Posted by son goku View Post
    If you install in (CSM) mode in UEFI computer, will it be able to boot from disks over 2 TB?
    Yes, but you will not be able to use the disk space beyond 2 TB since MBR does not support hard drives larger than 2 TB.

    Click image for larger version

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  6. #435


    Posts : 11
    Windows 7


    Thank you very much yet again genet for the very useful information!
    Last edited by son goku; 22 Feb 2015 at 08:20.
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  7. #436


    Posts : 22,272
    64-bit Windows 10


    Quote Originally Posted by son goku View Post
    As far as I know, Rufus (by design) only allows to create a USB flash drive that's UEFI bootable ONLY or Legacy BIOS bootable ONLY, and it does not allow to create a USB flash drive that can be booted in both UEFI and Legacy BIOS mode at the same time. I think that is what is causing your hang problem.

    If you want to boot and install in CSM mode, you need to set the Partition scheme and target system type in Rufus to "MBR partition scheme for BIOS or UEFI computers" which will make your USB flash drive Legacy BIOS bootable ONLY.

    If you want to boot and install in native UEFI mode you need to set the Partition scheme and target system type in Rufus to either "MBR partition scheme for UEFI computer" or "GPT partition scheme for UEFI computer" which will make your USB flash drive UEFI bootable ONLY.

    And make sure you set the boot mode in your UEFI firmware settings to UEFI mode or to CSM mode correspondingly -- that is UEFI mode for UEFI bootable flash drive, or CSM mode for BIOS bootable flash drive.

    I hope this helps
    The "MBR partition scheme for BIOS or UEFI computers" setting will have the USB show up twice in the boot menu for legacy BIOS (CSM) and UEFI.

    You just have to have your UEFI firmware set properly, and select the one you want to install Windows with.

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  8. #437


    Posts : 11
    Windows 7


    Oh, seems I was wrong? So you mean that the "MBR partition scheme for BIOS or UEFI computers" setting in Rufus will have the flash drive bootable and installable in both native UEFI and legacy BIOS (CSM) (provided that you set it in the UEFI firmware properly)? Have yo tested it to be the case?
    Because the way I understand it, the "MBR partition scheme for BIOS or UEFI computers" in Rufus is only for legacy BIOS (CSM) as when you point it to that option, it displays a description: "If you have an UEFI computer and want to install an OS in EFI mode however, you should select one of the other options."

    I could be wrong and that Rufus might have been updated already to support EFI+BIOS boot but, the FAQ entry of Rufus still states that:

    Why doesn't Rufus create a Windows installation USB that can be booted in both BIOS and EFI mode?
    If you are using a Windows ISO that can be dual booted in EFI or BIOS mode, you may find that the USB created by Rufus does not preserve the dual EFI+BIOS boot feature.
    Especially, the Windows 8 installation ISOs, that support both EFI and BIOS boot, will be converted to either one or the other mode, depending on the option you selected under Partition scheme and target type: If you select the first option (MBR partition scheme for BIOS or UEFI computers), the USB will be bootable in BIOS-mode only (even on UEFI systems), and if you select any of the other options, the USB will be bootable in EFI mode only (and not bootable on a BIOS system at all).
    This is done to avoid confusion, as it can be difficult for non expert users to know whether they actually booted in EFI or BIOS mode, when an USB Flash Drive can be booted in both modes, and installation is meant to be a one-off operation, targeting a very specific machine and boot mode. You probably don't want to go through a full Windows installation, only to realize that it was installed in BIOS mode, when you really wanted it installed in EFI mode.
    By ensuring that only one or the other can be used for Windows installation, there is no room for error with regards to which mode that was used for installation.
    Note that this does not apply for Windows To Go, and that you can also enable dual EFI+BIOS boot by using the Alt-E cheat mode (see below) with Rufus 2.0 or higher.
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  9. #438


    Posts : 22,272
    64-bit Windows 10


    Yep, tested and done it several times.
      My System SpecsSystem Spec

  10. #439


    Posts : 11
    Windows 7


    Oh thanks Brink! So it seems that the "MBR partition scheme for BIOS or UEFI computers" in Rufus does indeed create a flash drive that can boot/install in both BIOS and UEFI mode despite the FAQ entry. It seems that the Ruufus's FAQs just isn't updated I guess.
    May I know what version of Rufus have you tested it with?

    Thanks!
      My System SpecsSystem Spec

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UEFI Bootable USB Flash Drive - Create in Windows
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